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Update questions(my answers).sql #76

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12 changes: 10 additions & 2 deletions SQL Deep Dive/Like Operator/questions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,8 @@
* Sample output: https://imgur.com/vXs4093
* Use EXTRACT (YEAR FROM AGE(birth_date)) we will learn about this in later parts of the course
*/
SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
SELECT emp_no, first_name, EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees
WHERE first_name like 'M%'


/*
Expand All @@ -14,6 +15,8 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Question: How many people's name start with A and end with R?
* Expected output: 1846
*/
SELECT count(emp_no) FROM employees
WHERE first_name ILIKE 'A%R';


/*
Expand All @@ -22,7 +25,8 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Question: How many people's zipcode have a 2 in it?.
* Expected output: 4211
*/

SELECT count(customerid) FROM customers
WHERE zip::text LIKE '%2%';


/*
Expand All @@ -31,6 +35,8 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Question: How many people's zipcode start with 2 with the 3rd character being a 1.
* Expected output: 109
*/
SELECT count(customerid) FROM customers
WHERE zip::text LIKE '2_1%';


/*
Expand All @@ -40,4 +46,6 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Replace null values with "No State"
* Expected output: https://imgur.com/AVe6G4c
*/
SELECT coalesce(state, 'No State') as "State" FROM customers
WHERE phone::text LIKE '302%';